[sdiy] VCF schematic

[Scott Stites]

Small Bear!

http://www.smallbearelec.com/Categories.bok?category=Potentiometers+and+Trimpots

Cheers,
Scott

-----Original Message-----
>From: Romeo Fahl <rfahl at pdx.edu>
>Sent: Jan 23, 2007 11:25 AM
>To: synth-DIY DIY <synth-diy at dropmix.xs4all.nl>
>Subject: Re: [sdiy] VCF schematic
>
>Speaking of reverse audio pots, does anyone know of a source?
>
>Romeo
>
>
>On Jan 23, 2007, at 2:32 AM, Tom Wiltshire wrote:
>
>>
>> On 23 Jan 2007, at 02:32, Charles Bisaillon wrote:
>>
>>> I've also had a lot of troubles with the resonance circuit, it  
>>> doesn't feel
>>> like it is a linear pot I'm turning, the resonance creeps in  
>>> exponentially
>>> as I twist the knob. Choosing the right resistors was a big  
>>> compromise game.
>>> I've tried many things but I reach my limit of understanding.
>>
>> The SSM filters also have a similar quirk going on, so you're in  
>> good company. The datasheet shows the resonance increasing  
>> exponentially as the resonance CV increases linearly. The suggested  
>> solution is to use a reverse audio taper pot and to stick a  
>> resistor in series with it to cut off the bottom third of the  
>> travel where essentially nothing happens.
>>
>> Lovely schematic, by the way.
>>
>> Tom
>>
>>
>> ++++ Electric Druid ++++
>> Web Design & Development
>> http://www.electricdruid.net
>>
>>
>>
>


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